git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@79 35acf78f-673a-0410-8e92-d51de3d6d3f4

demos/ARM7-LPC214x-GCC/mmcsd.c

@@ -0,0 +1,97 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <ch.h>
+
+#include "lpc214x.h"
+#include "lpc214x_ssp.h"
+
+#include "mmcsd.h"
+
+static EventSource MMCInsertEventSource;
+
+void MMCInit(void) {
+
+  chEvtInit(&MMCInsertEventSource);
+}
+
+/*
+ * Initializes a card after the power up by selecting the SPI mode.
+ */
+BOOL mmcInit(void) {
+
+  /*
+   * Starting initialization with slow clock mode.
+   */
+  SetSSP(254, CR0_DSS8BIT | CR0_FRFSPI | CR0_CLOCKRATE(0), 0);
+
+  /*
+   * SPI mode selection.
+   */
+  sspRW(NULL, NULL, 16);        /* 128 clock pulses without ~CS asserted. */
+  int i = 0;
+  while (TRUE) {
+    chThdSleep(10);
+    if (mmcSendCommand(0, 0) == 0x01)
+      break;
+    if (++i >= CMD0_RETRY)
+      return TRUE;
+  }
+
+  /*
+   * Initialization.
+   */
+  i = 0;
+  while (TRUE) {
+    BYTE8 b;
+    chThdSleep(10);
+    b = mmcSendCommand(0, 0);
+    if (b == 0x00)
+      break;
+    if (b != 0x01)
+      return TRUE;
+    if (++i >= CMD1_RETRY)
+      return TRUE;
+  }
+
+  /*
+   * Full speed.
+   */
+  SetSSP(2, CR0_DSS8BIT | CR0_FRFSPI | CR0_CLOCKRATE(0), 0);
+  return FALSE;
+}
+
+/*
+ * Sends a simple command and returns a R1-type response.
+ */
+BYTE8 mmcSendCommand(BYTE8 cmd, ULONG32 arg) {
+  BYTE8 buf[6];
+
+  buf[0] = 0x40 | cmd;
+  buf[1] = arg >> 24;
+  buf[2] = arg >> 16;
+  buf[3] = arg >> 8;
+  buf[4] = arg;
+  buf[5] = 0x95; /* Valid for CMD0 ingnored by other commands. */
+  sspAcquireBus();
+  sspRW(NULL, buf, 6);
+  sspRW(buf, NULL, 1);
+  sspReleaseBus();
+  return buf[0];
+}

demos/ARM7-LPC214x-GCC/mmcsd.h

@@ -0,0 +1,31 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _MMCSD_H_
+#define _MMCSD_H_
+
+#define CMD0_RETRY      10
+#define CMD1_RETRY      100
+
+void MMCInit(void);
+
+BOOL mmcInit(void);
+BYTE8 mmcSendCommand(BYTE8 cmd, ULONG32 arg);
+
+#endif /* _MMCSD_H_*/